.article_tree{
    border:5px solid #1890ff;
    width:240px;
    box-sizing: border-box;
    float: left;
    margin:20px 0 20px 10px;
    h2{
        background-color: #1890ff;
        color:#fff;
        font-size:16px;
        height:40px;
        line-height:40px;
        text-align: center;
    }
    .article_ul{
        width:100%;
        height:600px;
        overflow-y: auto;
    }
}
.color-box{
    padding:8px !important;
    box-sizing:border-box;
    vertical-align: middle;
}
.color-block{
    width:100%;
    height:20px;
    display:block;
}